$$(16^{-2}\times9^{-2})^{2}$$
$\frac{1}{429981696}\approx 2.325680394 \cdot 10^{-9}$
$$\left(\frac{1}{256}\times 9^{-2}\right)^{2}$$
$$\left(\frac{1}{256}\times \frac{1}{81}\right)^{2}$$
$$\left(\frac{1}{20736}\right)^{2}$$
$$\frac{1}{429981696}$$
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$\frac{1}{2 ^ {16} \cdot 3 ^ {8}} = 2.325680393613778 \times 10^{-9}$
